问题
选择题
一个有理数的平方是正数，那么这个数的立方是 [ ]
A． 正数
B． 负数
C． 整数
D． 正数或负数
答案
答案：D
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一个有理数的平方是正数，那么这个数的立方是 [ ]
A． 正数
B． 负数
C． 整数
D． 正数或负数
答案：D
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| Sneaker is a kind of shoe worn by many people all over the world. Some say that the word "sneaker" is another word for tennis shoe, 1 no one really knows where the word came from. 2 say it came from the old English verb "sneak", which 3 to move silently and quickly. The only thing we are 4 is that when you put on a pair of sneakers, you 5 light-hearted, light-footed and ready to play. Sneakers of some kind are used by 6 who play tennis, basketball, and other sports. New design has been made 7 for people who run slowly. But perhaps sneakers are 8 used by children in the United States. In fact American children of 9 ages would much rather play in s  neakers than anything else, except perhaps 10 at all. New York City once held a poetry contest (诗歌比赛) for children. The subject was only "sneaker". Thousands of children sent in their 11 and praised the sneakers they love. One prize winner called 12 poem "The Sneaker and the World Peace". "When everyone is wearing sneakers," she said, "it will be impossible to 13 ." American school children can be seen every day 14 sneakers of all colours. They put them on in the morning and take them off 15 . Sneakers are 16 washed. In fact the older and dirtier they are, the 17 loveable they are. When their sneakers wear out (穿破), children hate to throw them off. How do you explain the closeness between 18 ? Perhaps another young 19 in the New York Poetry Contest said it best. "A shoe is just a shoe," he said. "But a sneaker is a 20 ." | ||||
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